View Compilation Error

0_0_39799735_6869.cpp: In function 'void solve()':
0_0_39799735_6869.cpp:48:29: error: incompatible types in assignment of 'int' to 'int [100005]'
   48 |     for(int i=1;i<=n;i++) su=su[i-1]+a[i];
      |                           ~~^~~~~~~~~~~~~